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Origin of Mélanges of the Franciscan Complex, Diablo Range and Northern California: An Analysis and Review

机译：方济会建筑群，暗黑破坏神山脉和北加利福尼亚的混杂山脉的起源：分析和评论

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摘要

The Franciscan Complex of California is characterized in part by the presence of mélanges. In general, mélange origins are attributed to sedimentary, tectonic, or diapiric processes—or a combination of these. Published reviews list the main features of mélanges characteristic of each type of origin. In this review, particular diagnostic features typical of sedimentary, tectonic, and diapiric mélanges are used to assess 15 specific mélanges, which in some cases have been interpreted in contrasting ways in the literature. The data do not support the view that most Franciscan mélanges were formed by sedimentary processes, but rather that both tectonic and sedimentary processes are important. There is little evidence that diapirism contributed significantly to Franciscan mélange genesis. Tectonic features present in most mélanges of subduction accretionary complexes create challenges in assessing mélange-forming processes. Notably, although tectonic overprints commonly mask the primary diagnostic fabric of sedimentary mélanges, some diagnostic features—such as depositional contacts, fossils in mélange matrix, and interlayering of mélange and non-mélange units—are critical to recognition of mélanges of sedimentary origin.
机译：加利福尼亚的方济各会建筑群的特点部分在于混杂的存在。通常，混杂混杂物的起源是沉积，构造或二叠纪过程或这些过程的组合。已发表的评论列出了每种原产地的混杂特征的主要特征。在这篇综述中，典型的沉积，构造和底栖混杂物的特殊诊断特征被用于评估15种特定混杂物，在某些情况下，这些混杂物在文献中已有不同的解释。数据不支持大多数方济各混杂岩是由沉积过程形成的观点，而是构造和沉积过程均很重要。几乎没有证据表明，偏见会极大地促进方济各混杂症的发生。大多数俯冲增生复合物中的构造特征对评估混杂形成过程提出了挑战。值得注意的是，尽管构造叠印通常掩盖了沉积混杂岩的主要诊断结构，但某些诊断特征（例如沉积物接触，混杂岩中的化石以及混杂岩和非混杂单元的夹层）对于识别沉积物混杂岩至关重要。

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